303     accum_type dist;		// distance from d to query point  member
305       : p(&_p), dist(_dist) {  in bbf_nn()
308       return dist < rhs.dist;  in operator <()
315     accum_type dist;		// minimum distance from bounds to query point  member
317       : node(_node), dist(_dist) {  in bbf_node()
320       return dist > rhs.dist;  in operator <()
328   void pq_alternate(int alt_n, bbf_pqueue & pq, scalar_type dist) const {  in pq_alternate()
333     pq.push_back(bbf_node(alt_n, dist));  in pq_alternate()
355     accum_type dist = 0;  in distance()  local
358       dist += diff * diff;  in distance()
359     } return (accum_type) sqrt(dist);  in distance()
372     } else if (nn_pq[0].dist > nn.dist) {  in bbf_new_nn()
377     assert(nn_pq.size() < 2 || nn_pq[0].dist >= nn_pq[1].dist);  in bbf_new_nn()